Mold-board for plox



(No Model.)

J. A. JOHNSON.

MOLD BOA-RD FOR FLOWS. No. 390,480. Patented 001i. 2, 1888.

WITNESSES W :jtjorngy u, PETERS, mawumm m. wmin gon, n. c.

Ilnrrnn STATES Parent Ornrcn,

JOHN A. JOHNSON, OF MADISON, \VISOONSIN.

MOLD -BOARD FOR PLOVVS.

EPECIFICATION forming part of Letters Patent No. 390,480, dated October 2, 11888.

Application filed lll'ay 7, 1888. Serial No. 273,113. (No model.)

To aZZ whom, it may concernr Be it known that I, JOHN A. JOHNSON, a

citizen of the United $t-ates, and a resident of Madison, in the county of Dane and State of \Visconsin, have invented certain new and useful Improvements in Mold-Boards for Plows; andIdo hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification, and in which Figure 1 is a perspective view of the inner side of myimproved mold-board for plows. Fig. 2 is a similar view of the re-enforcing frame detached from the moldboard proper, and Fig. 3 is a cross-section of my improved 1nold-b0ard.

Like letters of reference denote corresponding parts in the several figures.

This invention has relation to an improved construction of the mold-boards of plows, and has for its object to increase the strength, du rability, and wearing qualities of the board without at the same time unduly increasing its weight or the cost of manufacture.

To this end it consists in providing the moldboard on its inner side with a re-cnforcing frame made of steel or iron and fastened to the inside of themold-board around the edge of the same, substantially as will be hereinafter more fully described and claimed.

In the accompanying drawings, the letter A designates the mold-board, which may be of any suitable size or shape, according to the particular class of plows for which it is intended. This mold-board is made of a thin plate of steel, in the usual manner. To the inner side of the board is securely fastened a frame, B, made of steel or iron, and of any suitable thickness and width, said frame being of the same size and outline as the mold-board proper, so as to fit closely upon the same on the inside.

By providing the mold-board with a re-enforcing frame in the manner describedl provide against accidental breakage of the board by striking against obstructions, besides greatly increasing the wearing qualities of the board by making the edges of the same, where the wear comes, about twice the thickness of the middle part of the board,which has to sustain comparatively little wear. By my improvement the moldboard proper may be cut and shaped from flat plates of steel without requiring particular rolls or molds for shaping it; and, again, by making the thickness of the re-enforcing frame greater at the point of the mold-board I may still further i e-enforce or strengthen that part of the moldboard.

I am well aware that it is not new in the manufacture of mold-boards for plows to roll them in such a manner that the edges,orparts where the greatest wear co mes,shall be thicker and heavier than the middle part; and I am also aware that prior to my improvement socalled compound mold-boards have been made, consisting partly of iron and partlyof steel; but both of these constructions involve the use of special machinery. By my improvement, on the other hand, the mold-board proper may be cut and shaped from ordinary plat-es of commercial steel without the use of complicated and expensive machinery, and the reenforcing frame can be made and secured upon the mold-board proper by any artisan of ordinary skill, and without the use of machinery of any kind.

Having thus described my improvement, I claim, and desire to secure by Letters Patent oftheUnited States The combination, with a moldboard for plows, consisting of a plate of even texture and thickness, of a re-enforcing frame corre sponding in outline to the outline of the moldboard plate and permanently fastened to the same along its inner edge, substantially as and for the purpose herein shown and set forth.

In testimonythat I claim the foregoing as my own I have hereunto aflixcd my signature in presence of two witnesses.

JOHN A. JOHNSON.

Witnesses:

A. E. PROUDIFIT, J. H. NICHOLS. 

